SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d3426fb2655d001ff1966df41a56a484f756005dfefbb9a7d48867473eeb1c8' 
  AND token = '7zyjzrgsAoClsBin/LM+iV3Ggw4MnNjFR45Wg2xiG5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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