SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '752545f67dcce1ff3b352c5f7b3cf6adcfa1f37fa37c9779ed1ec9dd703edcf6' 
  AND token = '5X8enpE4lv3w4xyDu+gwKkCUwmZc/qJZrZzBbcLTtYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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