SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88d63487053c0eb009b8decb89ff02722481162343a09e39cbf87e2dbc872c21' 
  AND token = 'gKEyK8GQbnJ74q6wUtBtIdeHP7+AGeSJZEpafCN4z5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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