SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dd401b883ec9542b404153ca58b06ca9bfee8374d80ad54a51730b32635b9bc' 
  AND token = 'xDcDnscw965Gk4QHHV6jjJYhkCrYqLl7/PvuTlyZiIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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