SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e7cc93c881fb1ad86ecede91a8b206550db8a90f5f609b4fe3ae6523b4e863c' 
  AND token = 'XRx+1qFMuhzCIGWinvj6mKK9wWRA1bdm/lmsURct2kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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