SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4b03a3f1f424be3212d72f368dc9e45e76fa003b062f485a7be8f1c290119f7' 
  AND token = 'alB3Or1eTGhNuBmT4pOj+5f/2VACZVNwckqlrm9JMqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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