SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85b8a5170ff73573f118f4819f991c796db98d80dc89a1b7161648be284a4e23' 
  AND token = 'd2X/G+DkErTW0KWHz2IboUi7gVv4GE0l0sdJ8QFRq0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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