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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e98af2f043d3e8dbb06763e8e61da9de4954805f53c091b14d7ad51914dae073' 
  AND token = 'JKth3U2MFFZb02sq3n34CM5uQK1LWLllCtYwqkj4luQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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