SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f512dcac2fd89fad1a7f57971fe6b731d6f1e7b0c126301530b5569e5ee4b238' 
  AND token = 'CCw9M8plq8qgKch8wClFjqQYbrli3Joa7sAnLv5ytzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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