SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '469311852ab818a8b707276e318d42e62202160e7360633a9b3457841484097c' 
  AND token = 'nnjjRZ3BBzINxdYDYkqRzkprhHF+7CUxszNZ3udANTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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