SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '619c308377d64e29cd5fd5bf1419bae32e192b93dc5c0d953df6a0ecaaf8b78f' 
  AND token = 'RtAIbj95vaj7af7SvwQK4mJHPtgGSDnXaAVWiqt+MrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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