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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '972b8cfe305d2def4fa37ff1ad5a79e5bbcae9ddb6ec9d5305480b0dcdc0fc3f' 
  AND token = 'X0cWzkSwq9IVOnBQItAanzksKB8xNnnS1iSPDJMyOKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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