SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce4d849120569568d56a1fd4155f4ed6c4d8e0fdb71f74204610c7907522a897' 
  AND token = 'bq9rjAal6gACRinQd74HhrjzRVPkngqYjwxORjUJa38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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