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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4f7ff830c25e76d6f157696b4a01e040f63c8879ad936d492cba0b4ef715b39' 
  AND token = '42eWixLkoHqIAsVlA9NKfMm4kBbkTGa1E9o0txwlU3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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