SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc6e307ecffa7972918dc2bfd0bb3365613e81e60a55b436c0a83fa256706a5a' 
  AND token = 'DwkvCRMT86cL3RSrk+GQX7gOVThgmuaZ3dq52ugJKyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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