SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '621c7f72696e7e1c7b63a65a89778596bc3435cfe1db1dd65626f703bf8348e0' 
  AND token = 'iZPXjZFLz92VkEkoDhQKqe2OoWm7ZKIg+BAjB6HbOkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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