SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '043ad3d65bb2c9fec046379c71587630dac72ed1389c08be8ed6dac3f1c81fd0' 
  AND token = 'uNPRfcDTkOtZ2tl5F+zEUSX+qohqOwbYwx9D+gxpYDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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