SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e77c2c05e649696e646eb2cd209c2cd94cf50a4f3c09225f47d03fde452279f' 
  AND token = 'ZLIAQBtzGp8fmjxVUHP9aMihRFuVaHisgjhs/XuDjIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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