SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70d9b90383bf1b8debf76ef70c841a96d735c9c712d005bcd968ffd3adab5b23' 
  AND token = 'XZQ4HDJDPY+NCO65/U16ZNv/khXC5ThYbmkbf2G0Ebs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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