From the Super Mario Wiki
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Two Mini Marios, including the one with the key, begin on the lower level at the bottom left while the other begins near the very center, with the exit door on the bottom right. In order to reach it, they must be guided via a series of Blue Ladders and Red Girders to move the Mini Mario with the key up front.
The M-Token is located near the very center, atop a Red Girder platform on the middle level. To collect it, the center Mini Mario must simply get to the M-Token from its starting position.
Mini Mario Card
In order to earn a trophy, the player must score 14800 points.
In order to earn a trophy, the player must score 14100 points.