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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09ff6be8d13c26daac0d0537c391b99986f0935456cca9762e436e4210125adb' 
  AND token = 'zG4OiIJHL6m7yLGP+IE+XsGZ8ZTtzda33lznekzAp/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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