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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11b6e6a9226cdc32147582c35dcfeb45cd45385bd8d55ee7bdf1a1729080ea34' 
  AND token = 'tbdUlSNUS73/obtvkFWsfQ/p7HzEGuTA5nSgpJxHfME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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