SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12d6711c7b9c7b4cbfb774c5ef5187f334722b8faf36ff02873cd0c2bfe94352' 
  AND token = 'yoC/C9+YLYP9NNJVOZ4pmV2Mgx7bo3BK53wnvPRODsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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