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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bf4c4640f3aa4a063596b6ebd0c0c0b6c8f93e096e7998c023ae11043cc73aa' 
  AND token = 'YW/z7kvEGt+1rmhkeYfGB1fnybkc3tO/vJw7zty0mBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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