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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13af00b074d12fa1c3d895daf84bedd8509d9fe903fcaccd7ba53c9247bfe46c' 
  AND token = 'B+MjSa+038qLmr3UjYXEGg3A9HzlRUJcOrxf/YWpcYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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