SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a3d915765b05e601c386422464ff8b03fc8f964804dc4f883a74f95a6b5e22a' 
  AND token = '9B5MNryaP3tIBmYsB3PXxcHsoJcoyYMUcTJ+qZODDGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}