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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8464faf6b48c17553c9322ce8723757e43e31aac6bd135105775a4770f3f1185' 
  AND token = '76GnR7J267iQl4yFf4+5FgpiDBkSbgLuCs1dH5sVD8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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