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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d1a08e9086867a6e4c0ebae1f16b358811e21b51197eec57b00844121d8f000' 
  AND token = 'CD4DkPCXwJopNfutgOaNnB13s0MrpcW0jj+flg26LXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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