SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c63570f0fe9f3ad5ab5455693176978a1b51a06e7f2cc7b68e7a15592b82f05' 
  AND token = 'zpgQ3C7RcElU/hz+2f+VNVd9EoU/oVVLvLQuBtJgw5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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