SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49464ddf28a06ff11d67d963395487bb2113cad82aec56b50155319f40d5c016' 
  AND token = '9ItMqfBqMXgF/jq+80m7Xw+ApACPd/JPoq/2OYosow4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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