SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '081bee19186bb9162aa61549da5272ed3ef21ca045ae078a1e8bc945da6dd98e' 
  AND token = 'wNrx2M3s5sK/Oz5YjcC2g17pV+hO+FWv4u0PdhwHEuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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