SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5044a2530308c85c56ac5760d27a169c5a67a546e0befa8e728f4289f0eadba' 
  AND token = '57q12cwgwdK9EuDFyLcYQaBeVoKq0j+qZ/WnvRvaHdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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