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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57c0715efa113aea11ee6f070574201109cd0744ef62ee5f237abacf58fb9ca8' 
  AND token = '6vvcVJ8GZEgHtd7qSvTqhJOHe0tXUL9iMhCxxhZ88TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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