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You cannot locate it. In the course of the game, it will be given to you.
You do this near the end of the game, when you are in the lair of the Black Widow.
Use the key card to open the treasure room and battle the Black Widow. (see related questions)
You will receive a key to the Inspector's house, and find the stolen painting there. Then you will also find the Black Widow...
You only use the Black Widow key card at the end of the island, to open the sliding doors in her secret hiding place.
When the Black Widow catches you , you will have to pass the guard and at top you will use your card
For most of the game, the Black Widow is posing as the lady Chief Inspector. When you receive the key for the Inspector's house, you will recover the stolen painting, but you will be abducted to the Black Widow's lair.
It is the last part of the island, when you have discovered the stolen painting and get kidnapped by the Black Widow. Get past her guards and use the key card to begin the final battle.
The Black Widow key card is dropped by the art thief (shady guy) when he makes his escape by boat.
you go to the place that's called only nerds play poptropica
The key card is used later in the game in the Black Widow's lair. Save the key card and return to the museum.
The key that you get from Early Poptropica is to the Inspector's house in the Country Side. Once you find the missing painting on the second floor, you will, after a fashion, end up in the Black Widow's lair.