SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a334dfe324656075e31022a6ec2f55fffc65a4b2a9eeb988c8b45ad40a8afb3' 
  AND token = 'fBeSLszZh/lpPRLGIhHvC+8quAwuX/0YVDdKIsJLkGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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