Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '573da9fe575ec68e33785d2dd2e0b23c26676638cf75b6d13b725036d000d76f' 
  AND token = 'zzzz1Su+TRFUrPySfa1TMsA9tXS7qPIEQPwKQeLnfok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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