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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46fd0a77c8a6d73bf85b6c0f102d0018ee30b9aba167b76e47cca6e1c79a9eb7' 
  AND token = 'tAyNM7G5M5z7AAc+KsVnucjv1u75ONbKlEs+w0F1s6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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