SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9defc02a4aea4873933cf18d8f36d8557bb73f8fe2f8637b53217e6bd1d56104' 
  AND token = 'neJrKZRVC+B/56f0b16arP/LZRb+P8gyTDAcBiYDp/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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