SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4652919045c216fed82d33fab8e804b7f4068be02092e0f501fc9c3d76a937b8' 
  AND token = 'jGG4+ePvrp7DHN+jKHVrhA2DDvQ5htKuC1cYyET+SZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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