I have like 10 21-30lvl chests of color blue and red got by hunting mobs.Since I know nothing about chests when I try to open them it says it requires a key.
Where to get a key????

web depot give it away or u can buy it in cash shop

You actually get the keys in the Token store. Click the T and then look through everything until you find a pink egg. It should be 80 tokens. Open the egg, right click the chest you want to open, and drag the key there. The Web Depot's keys don't work on the 30- lower chests. Haven't tried any other chests yet, though, since I just got to 30 last night.

Thanks