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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f0a1dccc34feb72d10cbb561583de307daf813cc019855b2c8c4c33b531db23' 
  AND token = '8mwdU0fruZoomDqO5CgTiUMSI9jfOFypJhEjijftUF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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