to pick up a thing with chop-sticks or pincers
敧 centers on the action of picking up or gripping something with a tool like chopsticks or pincers.
敧 combines 奇 (unusual, strange) with 攴 (strike, action with a tool), suggesting a specialized action of picking up with an implement. The exact historical development is uncertain.
The left side 奇 looks like a strange tool, and the right side 攴 shows a hand holding a stick. Imagine using an unusual pair of chopsticks to pick up a slippery object.
For キ, picture a key-shaped pincer picking up a tiny key: key -> キ, and the tool grips it firmly.