Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a21e95a56373cae36a4c0ca33ba326e2180b297683980685be0e72938764def2' 
  AND token = 'AFCQiOeTA6DWGUoImH1Dyw7f8ufvvQYskdEpex2egws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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