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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c7863be776683156c904caa5a35527f626e2d20ae66e7a14a8de6c73070e360' 
  AND token = '7FQ1GT/LqLwyclc5YDp9BjFC/tfA7rv89ti/foTV7tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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