SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '364506725281de2738fe08e6eca5b474793bf10d2cdd2383ef38633c32a3f8cb' 
  AND token = 'q1momKN8xj+yTPlLpnlZJw3MBzrjg5PLE/At6VM7DVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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