Well if you're talking statistically, we all know LeBron James is a phenomenal talent. He leads the league in scoring and has close to 8 rebounds and 7 assists per game. That's pretty explosive.
If we're talking playing styles, there's absolutely no doubt that it's Kobe Bryant. I know what you might be thinking right now, this is a typical answer. But you have to remember that your question has the word "explosive" in it, a word that Kobe defines.
A close runner up is Amare Stoudemire. He looks to throw it down hard everytime he gets the ball, and he's an explosive big man. His play is very reliant on Steve Nash though, as most of his dunks come on that pick and roll they do near the key.
Hope this helped!