SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15071a314faadb46377716fb2c5e35b87c3e5bcb6cf863d6110541d78171b0d2' 
  AND token = 'dwVitJ9C64D579qz0a5/YzbkwAwjxeuz9EYHKfBLDR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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