SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88856a399512a895dbf4aefae506f13f8a16c92c688156e61c781198a9bcb8c8' 
  AND token = '/Or5DNoKrsv8zGDHrBS+ljqJiV+bGHBxeJZ5SRNGpOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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