SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6086182aae9b83d395251f15e765f0644e35660176c5e2b32a47aab9b5702e5' 
  AND token = 'RJWwgFpvJ/uAUKfMmcbT+kej7t+Ct+7k3uG5rU33HxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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