I am a level 42 life and I have the dragonspyre spiral key and I have been there before. Then it tells me that I can't go through it because the area is " not quite for me yet" I have no idea what happened..?
As you progress through the worlds, you download individual areas. If you receive that message, it means you're not done downloading that area yet. Look for the small spiral in the upper left corner that indicates how far you are into the download.
If you want the prize, you have to build the ladder rung by rung. There are no shortcuts.