SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07cfe995d92e256cebc75e6d5bbfb63237e156f4d54009e61c8b1143cc7f513d' 
  AND token = '99UysDkaiKBFaWnDuFThiW0snOv/JyjFW+NH4YttwM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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