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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2406db106930680b837072bbb558717da63d16faa22c8c10d30e5b64e4b14955' 
  AND token = 'p0HeotNJYOjapuRT/5d5polw1xwQXVvXfh5C2l91VTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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