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Unless you throw it at the ground near a flame.
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Nah, the flour would put out the flame by splashing out as it hits the ground and smothering it, effectively acting like a powder extinguisher, unless it was a fire that you were chucking it near, in which case any flour particles floating around in the air would probably burn up in the fire and make the flames look momentarily larger, and the majority of it would just stay on the ground.
Either way, you wouldn't get an explosion. The flour/grain dust explosions happen almost exclusively in big mills, elevators, and silos where the air is full of flour and grain particles.