SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df93521ae899ad6759fd1c1fb672ef8022c05ce482b66234cdd608e1c4ec741c' 
  AND token = 'RJDB2ZawkbItf04CAbzK/ttxIYhbqzRZY7AUwNSP7Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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