SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bfe76c518061d785f854538e62c8275d349adb15e55b6ed9d3958bf4e232156' 
  AND token = 'FRwSwIoQIgxveJImjt5F8Z8F9kOGds0iLg/vxAH8qNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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