SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86b4c43613970dbe423a0207f700e7c3c4e4da85e13d1697419e1269062c3192' 
  AND token = '/DsiOSuj3VTRCIJyqrPDlWKzFpxIXVARZDzlDZcbOcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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