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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '262e7ea549acca07a292a8fee7e2760d30d63ab2aff8e974fc3cb9ffd363948e' 
  AND token = 'gB5xx0vuwbvYMJ5cau6fH93h0Ihl9ou1WmTcDzIoU+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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