Burton came from behind to defeat Bristol Rovers thanks to Billy Kee's fourth goal in six games.
Rovers dominated the early exchanges and took the lead when Matt Harrold turned Craig Stanley's free-kick in with a powerful header.
Cleveland Taylor drilled a low shot from the edge of the area to level the scores before Key swept Kevin Amankwaah's cross in from eight yards.
In the second half Burton had the best chances as Rovers strived for a point.
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Burton Albion manager Paul Peschisolido told BBC Radio Derby:
"We've got to give them credit because they're a good side. They're big and strong and they've got attacking players who can cause you problems.
"I thought we weathered it very well; I thought the game plan worked extremely well. We took our goals well and so I'm delighted with the result.
"With set pieces, we never seem to get someone on the edge of the box to finish it off, but Cleveland Taylor did that today and his finish was fantastic.
"He got us back in the game because we were up against it but as goals change games. Straight after we scored that, we were in the ascendancy. We put them under pressure and got a second goal. "