SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e24aee804017ca0db0165e987a95f8da47a373b3a60428dd65a3235dcdf4f94c' 
  AND token = 'uR7i7/6QUOPvwXutSNiApmRVFSozBJ1dkgil1+hCmhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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