SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbf4e0cdfcdb39e40a0ccf91b7ebef76f460d58278a02196296f87031ba1f3bd' 
  AND token = '5WGxgmGc0TMbhXb+EafFsWvYzhItmYsIQXYyhOLuVVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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