To dream of a keychain represents everything you know you can do at the current moment. A situation that influences all you can do right now. Consider what the color and design of the keychain for additional symbolism.
Example: A man dreamed of seeing a keychain with Africa on it. In waking life he was experiencing a major life crisis that was preventing him from doing anything except dealing with it. The keychain with Africa on it reflected his awareness of himself only being able to deal with his problem. His problem left him desiring all he wanted in his life.