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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da6bf12faa684bd6465d2074c0962a00b8be39a5b8643ae3b8a2b4adb7ffa023' 
  AND token = 'VRzlDQfuTakc+eCdtQq2WqX8wYW2f5FcwQ9qWtL3CeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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