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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c83d83e8fdf5b6e2aca289c6df370e96250895e305a774c5ad87604ef8ee8d5c' 
  AND token = 'mAXahTHVOzcwCQc2A5N7pruLnF9QFi5ICieJUKOKhK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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