SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a60c363099a10b16eb0c7938471adecb04db59240d0065a8c57b48a5a344b818' 
  AND token = '1G/2MY/nCf+2Lqjh5xbRmKNrsmsvG6ZKL0XH6+j4x/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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