SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae5e2d437d0931c942e2df18c9cd6498fa31fb6a9c462f377ace29e951004f18' 
  AND token = 'RUl1vpv/kAwP3tqPPsFx5BtNJyV4X8+3+AIcsH5QK8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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