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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbe4f7d4c4dced79aac57b9f7224613b8b456f5bb082b8e79f67c24d5d2db9f3' 
  AND token = 'XwT0+TbIj6wunhyxKltO75CgcIdv0EkbxJVgSEySdKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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