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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d6f62a76b931a68fc5c61e1d517cc9a1566a800421ede7804c431bb0f219585' 
  AND token = '60OZYNjOXzyCJlgIkyVSgM8DZEYpa9VAopVhNNxAJlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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