SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30409c6dfce29b4b8f72954ad506a6b17afba84e54b98e424f6f20237b2237d8' 
  AND token = '6HRVnCSGT0w5k/beGWTXAEaooIJzvUFjaHzgXewqurI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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