SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc215b1ab21025559205b4aa40961c7e3e45f718c4fd7e74f9ad88807e20d250' 
  AND token = '3K7wrUZ8PV4R7wap5/4Aexj++vLaruhh9yGSDKlPCGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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