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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32254b6ea39c3272d4219bcde824be2ee665986188ca7390561ddd73033dddf7' 
  AND token = 'LGUPGKjzRk0MOk6kbM5jhcoL2mtXzVWugiGBW7K6VGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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