SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0424655b3a976e13d0609e374b8719a4221ed966df4a4eb966a7c84e473f91db' 
  AND token = 'sOyKpxu+tGmbA7rvS2wau6jWi9ZVx0CrjluU/ldz5yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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