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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23a5bae6c81c3df764f487ea7937449a6eb26188bf4e4fc79dcf34fdb5586e2c' 
  AND token = 'LX6GLrAhfGnC9SlZL8USmGaw7aSSKXZsCHJGFf9LuOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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