SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '998cfeb35ca0012bd526f2b694066a84accc70a258468a78777e461c1883b7dd' 
  AND token = 'VLzKDWrzdCgL4+8BNCeUyoiLfzhcd1BjqlXZBnDEpw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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