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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a155752c583fdb4b855e1df7f4feedce059b5b8173fe0be98d9c6b254f124b94' 
  AND token = 'ElkLWtufkCFboP4Hc2pS3N6hjtItGucTXM5WhxSo2Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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