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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b056c05b654a123a87404f7083ad217d165d22b55ac2c7a8f58980ccb636fb7' 
  AND token = 'cb+T4a27LTk5YtQapUQyTJ9/w+VXau8wqhb+Y7205YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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