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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f3193d54b685f69ae19aad4681b4e8b8beea6eda5a8f1602713e95275d9fe84' 
  AND token = 'dArEQeWAMg1SYD3u6nWFGsPwOveXF1o/AvwveWIZpjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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