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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c52cb0c013f245d3d83b3de9977c4814436d31fb7a8bb2f47a6dbc8bf3719dd9' 
  AND token = '5Rt4L8Wf6iuUtP5TF121W0h4vLwgiDlPT2JwzCcS/6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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