SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebe12e36fe057a15d309f1603355de4bd59a89905265de2379b62b559558f981' 
  AND token = 'LA0TELQ/IV6A4jjz4zZY2wfwaOgJUSp3q6p2RpgYRDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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