SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b586a57a10894700c1d103874696655473d1f50bf97f9a8df4f951bed6d932a' 
  AND token = 'durlKIyWgd2JhdTikvBjLAeZEp/9+hlUL3NVrzVUNq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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